EP0641114B1 - Preisgünstiger Abtaster für einen Tintenstrahldrucker - Google Patents

Preisgünstiger Abtaster für einen Tintenstrahldrucker Download PDF

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Publication number
EP0641114B1
EP0641114B1 EP94306275A EP94306275A EP0641114B1 EP 0641114 B1 EP0641114 B1 EP 0641114B1 EP 94306275 A EP94306275 A EP 94306275A EP 94306275 A EP94306275 A EP 94306275A EP 0641114 B1 EP0641114 B1 EP 0641114B1
Authority
EP
European Patent Office
Prior art keywords
print media
printing
scanner
light source
output tray
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94306275A
Other languages
English (en)
French (fr)
Other versions
EP0641114A1 (de
Inventor
Chuin Kiat Lim
Frank L. Cloutier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HP Inc
Original Assignee
Hewlett Packard Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of EP0641114A1 publication Critical patent/EP0641114A1/de
Application granted granted Critical
Publication of EP0641114B1 publication Critical patent/EP0641114B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/02418—Details of scanning heads ; Means for illuminating the original for picture information pick up and reproduction
    • H04N1/02445—Details of scanning heads ; Means for illuminating the original for picture information pick up and reproduction in the same plane
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00519—Constructional details not otherwise provided for, e.g. housings, covers
    • H04N1/00538—Modular devices, i.e. allowing combinations of separate components, removal or replacement of components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/02418—Details of scanning heads ; Means for illuminating the original for picture information pick up and reproduction
    • H04N1/02463—Details of scanning heads ; Means for illuminating the original for picture information pick up and reproduction using heads mounted on the same support or substrate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/0461—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa part of the apparatus being used in common for reading and reproducing

Definitions

  • This invention relates generally to optical scanners used to convert optical images into digital data for subsequent reproduction and/or manipulation, and more particularly to optical scanners used in conjunction with printers.
  • Optical scanners have long been used to capture existing optical images so that they may be transferred, stored, or manipulated using a more convenient means, typically a digital computer.
  • the scanner captures the image by illuminating the image with a light source and sensing reflected light.
  • the presence or absence of reflected light at a particular point determines the image characteristics at that point.
  • For a black and white image the absence of reflected light indicates a black region, while the presence of reflected light indicates a white region.
  • the intensity of the reflected light must also be measured to determine the intensity of the image.
  • separate light sources are used to detect the presence or absence of each color component.
  • the consumption of space by a scanner may also be prohibitive.
  • the computer user already has a computer, a monitor, a printer, and possibly a fax machine.
  • the computer user faced with steadily shrinking office space, has been reluctant to include additional computer peripherals in the confines of the user's immediate office space. especially if the device is not used frequently. However, this is exactly what is required for commercial success of the scanner.
  • peripherals that are not in constant use are relegated to a common office area where the device is shared by all of the people in the office. The effect of relocating the peripheral away from the user produces a productivity loss, resulting from walking to and from the device, proportional to the number of times the user must use the device.
  • MFPs multi-function-peripherals
  • printer copier
  • facsimile and scanner.
  • EP engine executes a process by which a polymer toner is transferred onto a print media and then fused onto the media.
  • Electrophotographic engines are being used in black and white copiers, printers and facsimiles and thus provide a good base for MFPs.
  • Colour EP engines are available but are considerably more expensive than black and white EP engines. As a result, colour EP engines are used in only the most cost insensitive applications, e.g. colour proofing, and, consequently, have not been used as a platform for MFPs.
  • the MFP has not been widely accepted by the marketplace. The primary reasons being, once again, cost and space. Although their cost is less than the combined cost of the devices purchased separately, the MFP is still too expensive for each computer user to own one, especially considering that most computer users already own one or more of the devices, most frequently a printer. In many cases, users own less expensive printers, such as an ink-jet printer, especially small business and/or home users who require colour printing. In addition, the MFPs, because of their increased functionality, consume more space than any one of the devices separately. As a result, these devices, if purchased at all, are once again relegated to a large common area where the device is shared by the office at large, resulting in the aforementioned productivity loss.
  • US Patent No. 4,851,925 discloses an image transfer device with an image sensor which scans an original image to form image signals.
  • the device also includes a printhead which together with said image sensor constitutes a movable unit and which prints an output image according to the image signals stored in a memory.
  • EP-A-0471369 discloses an optical scanning device in which a photoelectric transducer is likewise fastened to the cartridge of a mechanical movable printhead.
  • an object of the invention to disclose an apparatus in which a scanning capability is added to an existing ink-jet printer with little or no additional space required.
  • the invention provides an optical scanner which requires no alignment when operated in conjunction with an ink-jet printer mechanism, and which can accept cut-sheet and fan-fold paper.
  • the canner can be incorporated into an ink-jet printer to provide scanning capability in addition to the printing capability of the printer.
  • the scanner is contained in a housing which is mounted on the paper output tray which forms a part of the printer.
  • FIG. 1 is an ink-jet printer mechanism of the type fixed output tray capable of supporting a scanner mechanism according to the invention.
  • FIG. 2 is a side view of a second embodiment of the present invention.
  • FIG. 3 is a block level diagram of the control circuitry used to control the printing and scanning operations of the second embodiment of the present invention.
  • an ink-jet printer mechanism is indicated generally at 106.
  • the mechanism includes of an internal frame which includes a transverse rod 112.
  • the frame provides structure to the printer and defines a print media path 118. through which the print media passes.
  • the frame is encased by an enclosure 108.
  • Mounted on the frame is a carriage 110 which houses an ink-jet cartridge 120, commonly known as a printhead.
  • the printer mechanism also contains a printer access port 114 for coupling additional electronics, such as read-only-memory (ROM) containing additional fonts, to the printer electronics (not shown in FIG. 1).
  • ROM read-only-memory
  • a paper advancing means nor a carriage advancing means are explicitly shown. Both are housed within the printer enclosure 108.
  • the ability to advance paper in a precise and controlled manner is known in the art.
  • the paper is advanced by a predetermined amount after each pass of the printhead across the print media. The amount that the print media is advanced is determined by the amount of area covered by the pass of the printhead.
  • One common approach is to grasp the media between two sets of pinch-rollers rotating in opposite directions with one or both driven by stepper motors.
  • the printer electronics then pulse the stepper motors to advance the media by a fixed step.
  • the carriage 110 is advanced by similar means with carriage movement being synchronized to firing ink nozzles on cartridge 120, as is known in the art.
  • the media is held in an input tray 122 prior to being advanced through the print media path. Because the media is only advanced in response to the movement of the printhead. ink-based printers have the ability to accept continuous feed paper, such as that used in dot-matrix printers. After the media is advanced through the print media path 118, the media is deposited in an output tray 116.
  • the scanner mechanism indicated generally at 126 in FIG.2, is designed to be mountable on the output tray 116. Consequently, the scanner is precisely aligned to the print media by virtue of its position on the output tray.
  • the scanner is mounted directly over the print media as it passes through the print media path. This provides the scanner with an unimpeded view of the print media.
  • three light sources 136.138.140 are mounted on the rectangular scanner enclosure, or hood, 128 and span the width of the print media.
  • Each of the three light sources provides one of the color primitives required for full color reproduction, i.e., red-green-blue or cyan-yellow-magenta.
  • the light sources are similar to those used in the ScanJet IIc scanner manufactured by Hewlett Packard Co.. which are of the florescent type. However, as would be apparent to someone skilled in the art, a variety of similar light sources could be used such as LED arrays, etc.
  • the light emitted from the light sources is reflected from the print media 150 onto a mirror 142, which directs the light on a lens system (not shown) housed in a holder 144.
  • a charge coupled device (CCD) for sensing reflected light is also received in holder 144.
  • the light sources are designed so that the boundaries of the light rays, known as the optical spread 148, will narrow as they reflect off of the print media.
  • the optical spread 148 will continue to narrow to a width corresponding to the width of the CCD array.
  • the mirror 142 is attached to the enclosure 128 and is mounted parallel to the light sources and inclined with respect to the print media to allow the reflected light to be channeled onto the lens system housed in holder 144, as indicated by optical spread 148.
  • the lens system is designed to focus the light received from the mirror directly on the CCD.
  • the design of a lens system to accomplish this objective is known in the art.
  • the design of the lens requires a specific focal length based on the dimensions of the scanner, the lens itself may take on several different shapes, e.g., aspherical. It is desirable that the lens system focus the image onto the CCD in order to produce a one-to-one correspondence between the print media image pixel and the CCD sensor pixel.
  • a lens system can be readily constructed according to the commonly known formulas of optics.
  • the CCD produces an analog output signal corresponding to the light intensity received thereon.
  • the analog signals are converted to digital signals by an analog-to-digital converter (not shown in FIG. 2) housed in holder 144.
  • the digital signals are routed from the holder 144 to a cable outlet 146 with conventional wiring (not shown in Fig. 4) contained in the enclosure 128.
  • a cable 152 is attached to the cable outlet to receive the digital signals from the analog-to-digital converter as well as provide the necessary control signals to the CCD, the analog-to-digital converter, and the light sources 136. 138, 140.
  • the scanner electronics required to process the image and control the printer mechanism are enclosed in a scanner cartridge, pictured diagrammatically in FIG. 3 at 166.
  • the scanner cartridge is designed to fit within the printer access port 114 (FIG. 1), which is used to accommodate font cartridges as indicated above.
  • Within the scanner cartridge is a printed circuit board (PCB) on which all of the electronic components are mounted.
  • the scanner cartridge encloses the entire PCB except for a male edge connector having a plurality of metal contacts which, when inserted into the printer access port 114, provide an electrical path between the printer data and control signals and the scanner electronics, as well as providing connections to power and ground.
  • the scanner cartridge has within it a complete microprocessor based system.
  • the system includes: a general purpose microprocessor (CPU) 168, for executing program instructions; a read-only-memory (ROM) 170, for program storage; and a random-access-memory (RAM) 172, for temporary storage.
  • the scanner cartridge includes a direct-memory-access (DMA) controller 176, for arbitrating with the printer controller for control of the printer electronics.
  • DMA direct-memory-access
  • a red-green-blue (RGB) clock generator 180 sequences the light sources 136,138,140 as well as controls the CCD 184 and the analog-to-digital converter 186 (both contained within holder 144 in FIG. 2) via control lines 154 .
  • the control lines 154 are contained within cable 152.
  • the analog data is shifted out of the CCD 184 along signal line 156 under the control of the RGB clock generator 180 into the analog-to-digital converter 186.
  • the analog data is converted to a digital format by the analog-to-digital converter 186 and is returned to the data formatter 178 via signal line 158 also contained within cable 152.
  • the data formatter 178 formats the digital image into a format expected by the personal computer 190.
  • the data formatter 178 also buffers the data in order to transfer multiple bytes of data to the PC 190.
  • the digital data received by the data formatter 178 from the analog-to-digital converter 186 is transferred to the host PC 190 via a host interface board 188.
  • the host interface board 188 is an industry standard printed circuit board form factor capable of being inserted into the backplane of the PC 190.
  • the board 188 contains the industry standard male edge connector which allows it to be inserted into the standard female connector receptacle included within all PCs.
  • the host interface board 188 also includes the necessary logic and buffers to allow the scanner cartridge 166 to communicate with the PC 190 over the PC data bus 196.
  • the host interface board also provides a scanner cartridge connector (not shown) for receiving the scanner control lines 195 and scanner data bus 194.
  • the host interface board 188 acts as a gateway between the scanner cartridge 166 and the PC 190.
  • the logic (not shown in FIG. 3) on the host interface board 188 receives a request to transfer data from the DMA controller 176 over scanner control lines 195 and translates the request to a format required by the PC control lines 193.
  • the buffers (not shown in FIG. 3) on the host interface board 188 selectively enable the digital data on a scanner data bus 194 to be transferred to the PC data bus 196 upon the receipt of a DMA acknowledgement from the PC 190 over PC control lines 193.
  • the request to transfer the digital data from the scanner cartridge to the PC 190 is generated by the DMA controller 176.
  • the DMA controller 176 handshakes the digital data over the scanner data bus 194 by the use of scanner control lines 193.
  • the scanner control lines 193 encode a standard bus arbitration protocol, to coordinate the transfer with the PC CPU (not shown in FIG. 3).
  • the host interface board 188 enables the bus interface logic, thereby allowing the digital data to be transferred onto the PC data bus 196. This sequence continues until all of the digital data is buffered in data formatter 194 transferred over the PC bus 196.
  • the scanning sequence is operable under the control of a scanner driver program operating on the PC 190.
  • the PC 190 issues a command to the printer over a normal communication channel (not shown) between the PC 190 and the printer, e.g., parallel or serial channel. to commence scanning.
  • the command consists of a predetermined escape sequence which is parsed by the printer CPU to determine the purpose of the command.
  • the printer CPU notifies the scanner CPU 168 to assume control of the printer electronics.
  • the scanner CPU 168 will then execute the proper sequence of enabling light sources 136,138,140, capturing the image data. converting the analog image data to a digital representation. formatting the data to be received over the PC 190, transferring the data to the PC over the PC data bus 196, advancing the print media, and then repeating the sequence until the entire image is scanned.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimiles In General (AREA)
  • Image Input (AREA)
  • Facsimile Scanning Arrangements (AREA)

Claims (10)

  1. Vorrichtung zum Abtasten von optischen Bildern und zum Drucken, mit folgenden Merkmalen:
    einem Rahmen, der einen Druckmedienweg mit einem Anfang und einem Ende definiert;
    einer Einrichtung zum Vorschieben von Druckmedien entlang des Medienwegs;
    einer Einrichtung zum Drucken (110) auf Medien, die in dem Medienweg aufgenommen sind;
    einem Ausgabebehälter (116) an dem Ende des Medienwegs zum Aufnehmen der Druckmedien, nachdem dieselben den Druckmedienweg durchlaufen haben;
    einer Abtasteinrichtung (126), die an dem Ausgabebehälter (116) angebracht ist, zum optischen Abtasten der Medien, die in dem Ausgabebehälter (116) aufgenommen werden; und
    einer Einrichtung zum Auswählen zwischen dem optischen Abtasten von Druckmedien, die in dem Ausgabebehälter (116) aufgenommen werden, und dem Drucken auf Medien, die in dem Medienweg aufgenommen werden.
  2. Vorrichtung zum Abtasten von optischen Bildern und zum Drucken gemäß Anspruch 1, bei der die Abtasteinrichtung (126) die Druckmedien, die in dem Ausgabebehälter (116) aufgenommen werden, ansprechend auf die Einrichtung zum Vorschieben der Druckmedien optisch abtastet.
  3. Vorrichtung zum Abtasten von optischen Bildern und zum Drucken gemäß Anspruch 1 oder 2, die ferner folgende Merkmale aufweist:
    einen Wagen, der an dem Rahmen angebracht ist, zum Aufnehmen eines Druckkopfs zum Drucken auf die Druckmedien;
    eine Druckersteuerung, die mit der Druckmedienvorschubeinrichtung und der Druckeinrichtung wirksam gekoppelt ist, zum Steuern eines Druckbetriebs;
    ein Steuerungsschnittstellentor (114), das mit der Druckersteuerung wirksam gekoppelt ist; und
    einen Kommunikationskanal zum wirksamen Koppeln der Druckersteuerung mit einem Hostcomputer.
  4. Vorrichtung zum Abtasten von optischen Bildern und zum Drucken gemäß Anspruch 3, die ferner eine Abtasteinrichtungselektronikkassette (166) aufweist, die mit dem Steuerungsschnittstellentor (114) wirksam gekoppelt ist, zum Steuern von Abtastoperationen.
  5. Vorrichtung zum Abtasten von optischen Bildern und zum Drucken gemäß Anspruch 4, bei der die Abtasteinrichtungselektronikkassette (166) ferner folgende Merkmale aufweist:
    eine zentrale Verarbeitungseinheit (168) mit einem Bus und Steuersignalen zum Ausführen von Befehlen, die über den Bus empfangen werden;
    einen Nur-Lese-Speicher (170), der mit der zentralen Verarbeitungseinheit elektrisch verbunden ist und auf Anfragen von der zentralen Verarbeitungseinheit anspricht;
    einen Lese/Schreib-Speicher (172), der mit der zentralen Verarbeitungseinheit elektrisch verbunden ist und auf Anfragen von der zentralen Verarbeitungseinheit anspricht;
    eine Direktspeicherzugriffssteuerung (176), die mit der zentralen Verarbeitungseinheit elektrisch verbunden ist und auf Anfragen von der zentralen Verarbeitungseinheit anspricht; und
    einen Datenformatierer (178), der mit der zentralen Verarbeitungseinheit elektrisch verbunden ist und auf Anfragen von der zentralen Verarbeitungseinheit anspricht.
  6. Vorrichtung zum Abtasten von optischen Bildern und zum Drucken gemäß einem der Ansprüche 3 bis 5, bei der der Kommunikationskanal folgende Merkmale aufweist:
    ein Eingangs/Ausgangskabel (152) zum elektrischen Verbinden der Druckersteuerung mit einem Hostcomputer; und
    eine Hostcomputerbusschnittstellenkarte (188) zum wirksamen Koppeln der Druckersteuerung mit einem Hostcomputer über das Eingangs/Ausgangskabel.
  7. Vorrichtung gemäß einem der Ansprüche 1 bis 6, bei der die Abtasteinrichtung (126) folgende Merkmale aufweist:
    eine Haube (128), die an dem Druckerausgabebehälter (116) anbringbar ist;
    eine Lichtquelle (136, 138, 140), die an einer inneren Position der Haube angebracht ist und zu dem Druckmedienweg hin gerichtet ist;
    einen Spiegel (142) zum Reflektieren eines Bildes auf Druckmedien, die von der Lichtquelle beleuchtet werden; und
    einen Sensor (184) zum Erfassen eines solchen reflektierten Bildes und zum Umwandeln desselben in ein elektrisches Signal.
  8. Vorrichtung gemäß Anspruch 7, bei der Ausgabebehälter (116) im wesentlichen rechteckig ist und die Haube (128) eine im wesentlichen rechteckige Basis aufweist, wobei die Basis von dem Ausgabebehälter (116) getragen wird, wenn die Vorrichtung an dem Ausgabebehälter (116) angebracht ist.
  9. Vorrichtung gemäß Anspruch 8, bei der die Basis eine im wesentlichen rechteckige Öffnung einer Größe aufweist, die es ermöglicht, daß Licht von der Lichtquelle ein Bild auf Druckmedien beleuchtet, die von dem Druckmedienweg in den Ausgabebehälter (116) aus eintreten.
  10. Vorrichtung gemäß einem der Ansprüche 7 bis 9, bei der die Lichtquelle die Breite der Druckmedien überspannt und die Lichtquelle ferner folgende Merkmale aufweist:
    eine erste Lichtquelle (136), die an der Haube angebracht ist;
    eine zweite Lichtquelle (138), die an der Haube im wesentlichen parallel zu der ersten Lichtquelle angebracht ist; und
    eine dritte Lichtquelle (140), die an der Haube im wesentlichen parallel zu der ersten Lichtquelle angebracht ist.
EP94306275A 1993-08-30 1994-08-25 Preisgünstiger Abtaster für einen Tintenstrahldrucker Expired - Lifetime EP0641114B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/113,878 US5532825A (en) 1993-08-30 1993-08-30 Add-on scanner for existing ink jet printer
US113878 1993-08-30

Publications (2)

Publication Number Publication Date
EP0641114A1 EP0641114A1 (de) 1995-03-01
EP0641114B1 true EP0641114B1 (de) 1999-05-12

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US (1) US5532825A (de)
EP (1) EP0641114B1 (de)
JP (1) JP3609857B2 (de)
DE (1) DE69418400T2 (de)

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JP3609857B2 (ja) 2005-01-12
DE69418400D1 (de) 1999-06-17
JPH07107246A (ja) 1995-04-21
EP0641114A1 (de) 1995-03-01
DE69418400T2 (de) 1999-09-23
US5532825A (en) 1996-07-02

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